linux-kernel - Re: [PATCH] lib/scatterlist: Add SG_CHAIN and SG

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Message-ID: <1518597168.24629.4.camel@suse.de>
Date:   Wed, 14 Feb 2018 09:32:48 +0100
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        bart.vanassche@....com, axboe@...nel.dk, chris@...is-wilson.co.uk,
        tvrtko.ursulin@...el.com
Subject: Re: [PATCH] lib/scatterlist: Add SG_CHAIN and SG_EMARK macros for
 LSB encodings

On Wed, 2018-02-14 at 10:28 +0530, Anshuman Khandual wrote:
> This replaces scatterlist->page_link LSB encodings with SG_CHAIN and
> SG_EMARK definitions without any functional change.
> 
> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
> ---
>  include/linux/scatterlist.h | 23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/include/linux/scatterlist.h
> b/include/linux/scatterlist.h
> index 22b2131bcdcd..63d00bdb2fb3 100644
> --- a/include/linux/scatterlist.h
> +++ b/include/linux/scatterlist.h
> @@ -65,16 +65,18 @@ struct sg_table {
>   */
>  
>  #define SG_MAGIC	0x87654321
> +#define SG_CHAIN	0x01
> +#define SG_EMARK	0x02

SG_EMARK sounds strange, what about SG_END?

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